Form for concrete structural work.



M. S. HOTCHKISS.

FORM FOR CONCRETE STRUCTURAL WORK.

APPLICATION FILED APR. 15, 1909 955,800. I Patented Apr. 19, 1910.

2 BHEETS-SHEET 1.

WITNESSES: INVENTOR 714 a yww/ I I BY "f'* e; W

fr AT ORNE M. s. HOTOHKISS. FORM FOR CONCRETE STRUCTURAL WORK.

APPLICATION FILED APR.15, 1909.

Patented Apr. 19, 1910.

2 SHEETS-SHEET 2.

INVENTOR WITNESSES 81/11 Z ATTORN EY UNITED STATES PATENT OFFICE.

MARK S. HOTCHKISS, OF LESTEBSEIRE, NEW YORK, ASSIGNOR TO HOTCH KISS LOCK METAL FORM COMPANY, OF BINGHAMTON, NEW YORK.

Specification of Letters Patent.

Patented Apr. 19, 1910.

Application filed April 15, 1909. Serial No. 490,113.

To all whom it may concern:

Be it known that I, MARK S. HOTOHKIBS,

a citizen of the United States, residing at Lestershire in the county of Broome and State of New York, have invented certain new and usefullmprovements in Forms for Concrete Structural Work, of which the fol lowing is a specification.

This invention relates to improvements in sectional forms to be used in erecting concrete walls, foundations, etc, of buildings and other structures; and my object is to provide light and durable form sections with interlockin joints, so constructed that' the sections will held together with abutting edges so joined as to provide perfectly smooth inside surfaces when the form is set up. I attain my object by constructing the form sections in the manner illustrated in the accompanying drawings, in which- F igu one tier of form sections set up for the angle of a concrete wall; Fig. 2, a transverse view of the form showing the first tier of form sections filled with concrete, and a secondtier set in place thereupon; Fig. 3, an e1evation of one of the form sections as viewed from the outward side; Fig. 4, a sectional view on an enlarged scale, showing my preferred form of interlocking joint between sections; and Fig. 5, plan and sectional views of an adjustable spreader to be used in connection with these sectional forms.

Like numerals designate like partsin the several views.

The form sections consist of light metal plates, preferably of galvanized iron, out square or oblong, with true edges and of any desirable dimensions. As illustrated these plates are shown two feet square, so that when set 11 as'shown in Fig. 1, a wall course two eet hi h may be filled in. Along the top of each p ate I rivet an angle bar 2, said angle bar projecting about threeeighths of an inch above the edge of the plate; and alon one side of the plate I rivet a flat strip 3, w ich also projects beyond the side edge of the plate about three-e1 hths'of an inc these angle bars and si e stri s being fastened on corresponding sides of t e plates of a set. I also rivet on the plates one or more reinforcing aliiigle bars 4, to give them the necessary sti mess to prevent bulging or bending as the concrete 1s filled re 1 represents an isometric view of overlap the into the form. At the bottom of the plates I riveton short bars of Z form 5 threeeighths of an inch above the bottom edge, said 2 bars, when one section is placed above another, bem adapted to rest upon and engage the ang e. bar 2 on the section below, as shown in Fig. 4.. The lower edge of the upper form section will pass down inside the an le bar of the lower section to rest upon t e/upper ed e of the plate of the lower section; and t e 2 bar on the upper section will enga e the outer edge of the angle bar on the ower section, thereby securely interlocking the sections, and securing a perfectlgeflush joint between sections,

a smooth inside surface for so as to provi the form. The angles 2 also serve to protect the top edges of the lates from the workmen when shoveling t e concrete into the forms.

The side strip 3 on each form section-will plate on the next adjacent section in a horlzontal tier of sections, as shown in 'Fig. 1, thereby bringing the vertical ed es of abutting plates into true alinement. f, however, 'it is desired to provide a more secure interlocking'joint between the abutting vertical edges of the plates, I may use an angle bar in place of the overlapping strip 3 on the one plate, and provide Z bars 5 on the other plate; thus reventing the side edges of the plates from Being thrown laterally out of alinement in eitherdirection. In other words, each section will have fastened to lts right and left sides, respectively, an angle bar and 2 bars corresponding to the angle bar 2 and 2 bars 5, fastened to the top and bottom respectively of plate 1 in Fig. 3. In

setting up these sections to build the form,

with the 2 bars 5 resting upon the footin strips. Spacing bars, orvs readers,'9, wi

then be set in at the to etween elpposlte sections to hold them -t e roper, lstance apart, and wires 10 will be coped through holes 11 provided therefor in a uttmg sections, the ends of said wires being passed across through the opposite sections and.

For turningthe angles I provide sections.

as shown at 1, made in two parts, hinged together at 6 to form the outward corner of the wall; and for the inside of the corner'I provide sections 1 having on one side, in place of the overlapping strip 3, an angle bar 7,

setback from the edge the thickness of asection' plate to receive the plate 1 of the other section which forms the angle, as shown where this section plate is broken away in Fig.1. As so 'constructedthe sections are adapted to be set up to turn corners of different angles, and are not limited to right angled structures.

. Where a cross wall intersects a main wall, a section 1 will befused to form one angle of the cross wall, in the same manner as shown in Fig. 1, and, the other corner will be formed by setting a section 1 in the main wall form to engage a section 1 in the cross wallform in like manner,

After one tier of form sections has been filled in, as shown in Fig. 2, the next tier of form sections will be set up on and inter locked' with the first; and the Spreaders which were taken from the first tier, as the concrete was filled in, will be used to space the upper portion of the next tier of sections, the wire binding between the sections of the first tier remaining embedded in the concrete. has been filled in, the sections on the first tier may be removed, and set up upon the top of the second tier, the second tier of sections being held. in place by the binding wires 10, which are then embedded in the concrete. To remove the sections ofthe, first tier it is simply required to cut the binding wires where they project outside the sections. In this way the .eontractor is not required to sup lied with an overly large number of these orm sections. I

These sectional forms may be set up for any width of wall without change, the only requirement being that Spreaders be supplied to correspond with the width of the wall. Usually these Spreaders are formed from wooden 2X4s, orthe like, and cut to a length corresponding to the width of wall required. After being used on a job these wooden s readers. are usuall% thrown away or waste in other ways.

this use 'of'lu'mber andconsequentwaste of materials, I provide in conjunctionwith my 3 As soon as the next tier of sections forms adjustable .spreaders made of metal and constructed in the manner illustrated in Fig. 5. These s readers consist of two plates, 12 and 13, a aptedto set one against the other; the plate 12 being provided with preferably two projecting pins 14, and the plate 13 with a plurality of holes 15 to receive said pins;.the two plates being held together by aband 16 adapted to slide thereover. The projecting ends of the plates are cut and bent in opposite directions at'17 and18, to form bearing surfaces where the spreaders rest at their ends against the opposite section'plates. By sliding, theband 16 to one side the pins 14. .on the plate :12 may be inserted in other holes 15 in plate 13, thereby lengthening the spreader where a wider wall is to be built. These spreaders are light and durable, and can beso constructed as to be. adjusted to any of the standard thicknesses of building walls.

Various modifications may be made inthe size and thickness of the plates, the method of bracing the plates, and in other details of construction, without departing from the spirit of my invention. Instead-of employing short Z bars I may use one continuous bar extending across the bottom or side of a plate, these continuous Z bars, together with the opposite angle bars 2, then forming a continuous brace around the edge of the plate. I Where ,door and window openings occur section plates of. the same construc- :tion, but narrower, may be employed, so that the forms may be brought up properly to the openings.

What Iclaim as my invention and desire to'secureby Letters Patent is Form sections comprising plates each having/on its outward side anangle bar extending alon and projecting'a certain distance beyon one edge with its outturned member positioned away from the plate, and a Z-bar set back a' corresponding distance from the opposite edge and adapted to engage the outward edge of the angle bar on an adjoining section, whereby the section lates may be set u with butt joints and ocked against latera displacement in either direction. V In testimony whereof I have aflixed my signature, in presence of two witnesses.

7 MARK S. HOTCHKISS. Witnesses A I i W. D. EDIMEISTER, CAssm A. Ron. 

